#include <stdio.h>
#include <setjmp.h>

jmp_buf buf;

void function1(int x) {
    printf("Function1 called, x = %d.\n", x);

    if(setjmp(buf) == 0) {
        printf("We just set the jump.\n");
    } else {
        printf("We just jumped here from longjmp (x = %d)!\n", x);
    }

    printf("Function1 returning.\n");
}

void function2() {
    /* go to the setjmp location and pass a 1 */
    printf("Jumping!\n");
    longjmp(buf, 1);
}

int main() {
    printf("Main starting.\n");
    function1(10);
    function2();
    printf("Main ending.\n");
    return 0;
}